package com.disdr.picture;


import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
public class bmpReader {

    /**
     * * @param args
     * * @return
     * * @throws IOException
     * */
    public static void  ReadBMPPic(String src) throws IOException     {
        FileInputStream fis=new FileInputStream(src);
        BufferedInputStream bis=new BufferedInputStream(fis);
        //丢掉文件头信息         bis.skip(38);
        //获取biXPelsPerMeter与biYPelsPerMeter
        byte[] b1=new byte[4];
        bis.read(b1);
        byte[] b2=new byte[4];
        bis.read(b2);
        int Xdpi=byte2Int(b1);
        int Ydpi=byte2Int(b2);
        System.out.println("biXPelsPerMeter:"+Xdpi+" biYPelsPerMeter:"+Ydpi);
        bis.close();
    }
    private static int byte2Int(byte[] b) throws IOException {
        int num = (b[3]&0xff)<<24 | (b[2]&0xff)<<16 | (b[1]&0xff)<<8 | b[0]&0xff;
        return num;
    }
    public static void main(String[] args) throws IOException {
        ReadBMPPic("E:\\我的文档/总配置 - 副本.jpg");
    }
}
